Easy access isn’t the problem and hasn’t even been tried. There isn’t easy access. There’s illegal access through shady networks with unverified merchants and products. That’s the result of the prohibition… that and decades of a stupid war on drugs.

“Opening it up more” presumes that I mean “give more people more access to more drugs in the same way they do now.” That’s not at all what I mean.

There are some social crises in people life where policing themselves gets lower focus

Sure. Then they can just go to their local gas station drug dealer and buy some meth then. Your solution doesn’t seem much better. I don’t see how this really argues against a utilitarian approach to drug regulation.